Harnessing Epigenetic Stress Memory via CRISPR-Nanoparticle Integration for Climate-Resilient Agriculture

Abstract

Climate change is pushing crop plants into stress conditions that outpace what conventional breeding can keep up with, and this has pushed researchers to look past the DNA sequence itself for tools that work faster. One of the more interesting angles is epigenetic stress memory, the ability of a plant to hold onto a molecular record of a past stressful event, encoded in DNA methylation, histone marks, and small RNAs, so that it responds faster or stronger the next time. Separately, CRISPR dCas9 based epigenome editing tools now let researchers write or erase these marks at a chosen locus without cutting the DNA, and nanoparticle delivery systems, especially carbon nanotubes and lipid or polymeric carriers, are solving the long-standing problem of getting these tools into plant cells without tissue culture, without a transgene footprint, and across a much wider range of crop species than Agrobacterium ever could. This review pulls these three threads together. It walks through the mechanisms of stress memory, the current state of CRISPR epigenome editing in plants, and the nanoparticle platforms now used for plant genetic engineering, and then lays out a conceptual pipeline for how nanoparticle delivered epigenome editors could be used to deliberately install useful stress memory in crops such as wheat, rice, and maize. It also takes an honest look at where this convergence is still mostly conceptual rather than demonstrated, and points to the delivery, stability, and regulatory gaps that need to close before this becomes a field tool rather than a lab concept.

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